Hi and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, is this a fresh/new installation of the Panasonic KX-TG7731? ...or has it been in use for some time and this issue of "...does not ring..." only recent?When you try to call the Panasonic's number (using another phone/mobile), can you hear it ring on the calling phone? (even if the KX-TG7731 will not)And is there a "BELL" icon with a diagonal line displayed on the handset?